Final answer:
Gusta believes Chaya would make a good courier due to her being small and inconspicuous, smart and resourceful, and brave, making the correct answer (d) All of the above.
Step-by-step explanation:
In the book Resistance, Gusta thinks Chaya would make a good courier because of several reasons that are collectively true.
Therefore, the correct answer is (d) All of the above, meaning that Gusta believes Chaya is small and inconspicuous, smart and resourceful, and brave.
Each of these qualities contributes to Chaya's potential effectiveness as a courier, with her size allowing her to avoid unwanted attention, her intelligence and resourcefulness enabling her to solve problems on the fly, and her bravery ensuring that she can face the dangers that come with resistance work.